# Base emitter voltage and collector current

1. Aug 2, 2014

### ranju

Does decrease in value of base-emitter voltage decreases collector current..??
As I studied that decrease in base-emitter voltage of some part of signal to lesser ammplification of that part due to smaller current..but how base emitter voltage is leading to less collector current..
because if base-emitter voltage decrease , base current increase which further increase collector current..

2. Aug 2, 2014

### Staff: Mentor

Yes.

If VBE decreases, base current decreases. It's a p-n junction, so the characteristic is that of a p-n junction diode. If the forward voltage increases, the forward current increases.

3. Aug 2, 2014

### ranju

But base-emitter voltage is a barrier voltage.. so if it decreases , base current should increase..!!!

4. Aug 2, 2014

5. Aug 2, 2014

### ranju

But is'nt there any logic behind it...??
because if we see this equ.
Ib=Vb/Rb - Vbe/Rb
so from this equ. it can be seen that if Vbe increase base current decrease..!!!

6. Aug 2, 2014

### jim hardy

have you ever run across the formula for current through a junction,
I=eqv/kt
where v would be your Vbe ?
That's what dlgoff's graph is showing you.

that involves not only Vbe but an external Vb and an external Rb.